Question about 1999 Pontiac Grand Prix
The car will crank up and run great for 20 or 30 sec. then it will start to miss and run like ****. it is like it is staved for gas or getting to much gas. there is alot of black soot on the rim of the tail pipe.and there is a really strong smell of fuel when it gets done spitting and sputtering. i have replaced the fuel filter,pcv valve, new air filter. the 3 front plugs. have not got to the back 3 yet. going to do that now. 12:53 in the a.m. i plugged a actron OBD 2 pocketscan in to the plug and it says no codes found. so where do i go from here. i need all the help i can get. how do i check if it is relay or the egr valve is leaking. how do i test the egr valve. or if it is a defective ECM. what are they, where are they, and how do i test if they are bad? i have a haynes repair manual but it does not have a layout of the 3800 super charged engine to show me where these parts are located. thanks for all and any help.
I had the same problem. My temp light came on on my dash. I hooked up to a computer and it showed that that temp of the car was 248 degrees when the engine is really 165 degrees. It was the computer sensor. The sensor is under the thermostat and was about 15 dollars. It took about 30 mins to change.
Posted on Aug 19, 2008
No it doesnt sound like a bad ignition.... it would most likely be a bad sensor MAF, MAP, O2,...(mass air flow, manifold apsolute pressure, oxygen sesor) the black smoke is a def. indication of over fueling... other than sesors its possible it could be the fuel pressure regulator......all this depends on the fuel system set up couldnt tell you for sure without looking at the car or the book
Posted on Aug 07, 2008
Same thing is going on with mine. It sounds like the ignition switch is bad.
Posted on Jul 30, 2008
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Posted on Jan 02, 2017
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